https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95725
--- Comment #6 from Haoxin Tu <haoxintu at gmail dot com> --- Hi, there. I hold the view that the compiler should have good fault tolerance, which means giving an input(even invalid), the compiler might emit appropriate error message diagnostics so that we can fix them into valid code according to the diagnostics. I have tested in both GCC and Clang, the results show that GCC has lots of unrelated diagnostic messages than Clang. In this report, GCC-trunk seems ok, but GCC-9 emits too many duplicated error messages. So I guess there might something not correct in FE. Finally, I am wondering if those cases are useful for the GCC community? If not, I will stop reporting similar test cases (invalid code but let GCC get confused while parsing it). Thank you all!